Method and apparatus for determining reference signals in mobile communication system

• US 20110235682A1
• Filed: 03/25/2011
• Published: 09/29/2011
• Est. Priority Date: 03/26/2010
• Status: Abandoned Application

• Current Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Original Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Inventors: He, Hong, Li, Yingyang, Sun, Chengjun
• Application Number:
  US13/065,646
• Publication Number:
  US 20110235682A1
• Time in Patent Office: Days
• US Class Current: 375/132
• CPC Class Codes: H04J 13/22 Allocation of codes with a zero correlation zone
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Embodiments of the present invention provide a method and an apparatus for determining reference signals. A User Equipment (UE) obtains group hopping information and/or sequence hopping information of a UE-specific reference signal from cell-specific system information broadcasted by an eNB. The UE receives UE-specific control information transmitted by the eNB to the UE. The UE generates a UE-specific reference signal of a first slot according to the group hopping information and/or sequence hopping information of the broadcasted cell-specific reference signal. If the UE-specific control information indicates that group hopping and/or sequence hopping of UE-specific reference signals is disabled, the UE generates a UE-specific reference signal of a second slot in a same frame with the first slot according to the UE-specific reference signal of the first slot. The UE is able to determine the reference signals when multiple UEs share physical resource blocks.

Claims

1. A method for determining reference signals, the method comprising:

obtaining, by a User Equipment (UE), at least one of group hopping information and sequence hopping information of a UE-specific reference signal from cell-specific system information broadcasted by an enhanced Node B (eNB);

receiving, by the UE, UE-specific control information transmitted by the eNB to the UE;

generating, by the UE, a UE-specific reference signal of a first slot according to at least one of the group hopping information and the sequence hopping information of the broadcasted UE-specific reference signal; and

if the UE-specific control information indicates that at least one of group hopping and sequence hopping of UE-specific reference signals is disabled, generating a UE-specific reference signal of a second slot in a same frame with the first slot according to the UE-specific reference signal of the first slot.

2. The method of claim 1, wherein a hopping flag in the UE-specific control information indicates whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled.

3. The method of claim 2, wherein one of a ‘

0’

value and a ‘

1’

value of the hopping flag indicates that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled.

4. The method of claim 1, wherein a zero padding field in the UE-specific control information indicates whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled.

5. The method of claim 4, wherein when the value of zero padding field is configured according to a pre-defined criteria, determining that the zero padding field indicates that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled.

6. The method of claim 5, wherein configuring the value of the zero padding field according to the pre-defined criteria comprises one of:

configuring all bits of the zero padding field to be ‘

1’

; and

configuring at least one bit of the zero padding field to be ‘

1’

.

7. The method of claim 6, wherein configuring at least one bit of the zero padding field to be ‘

1’

comprises one of;

configuring a Most Significant Bit (MSB) of the zero padding field to be ‘

1’

; and

configuring a Least Significant Bit (LSB) of the zero padding field to be ‘

1’

.

8. The method of claim 1, wherein a new information field in the UE-specific control information indicates whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled.

9. The method of claim 8, wherein the new information field comprises one of:

a hopping flag in the UE-specific control information; and

a new bit appended to the UE-specific control information.

10. The method of claim 9, wherein when the value of the new information field is one of ‘

0’ and

‘

1’

, determining that the new information field indicates that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled.

11. The method of claim 1, wherein generating the UE-specific reference signal comprises generating parameters of the UE-specific reference signals, the parameters comprising at least a sequence-group number and a base sequence number.

12. An apparatus in a User Equipment (UE) for determining reference signals, the apparatus comprising:

a controller configured to obtain at least one of group hopping information and sequence hopping information of a UE-specific reference signal from cell-specific system information broadcasted by an enhanced Node B (eNB);

a receiver configured to receive UE-specific control information transmitted by the eNB to the UE; and

a generator controlled by the controller and configured to generate a UE-specific reference signal of a first slot according to at least one of the group hopping information and the sequence hopping information of the broadcasted UE-specific reference signal,

wherein the generator, if the UE-specific control information indicates that at least one of group hopping and sequence hopping of UE-specific reference signals is disabled, is further configured to generate a UE-specific reference signal of a second slot in a same frame with the first slot according to the UE-specific reference signal of the first slot.

13. The apparatus of claim 12, wherein the controller is further configured to determine whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled based on a hopping flag in the UE-specific control information.

14. The apparatus of claim 13, wherein the controller is further configured to interpret that one of a ‘

0’

value and a ‘

1’

value of the hopping flag indicates that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled.

15. The apparatus of claim 12, wherein the controller is further configured to determine whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled based on a zero padding field in the UE-specific control information.

16. The apparatus of claim 15, wherein the controller is further configured to determine that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled when a value of the zero padding field meets a pre-defined criteria.

17. The apparatus of claim 12, wherein the controller is further configured to determine whether at least one of the group hopping and the sequence hopping of the UE-specific reference signals is enabled based on a new information field in the UE-specific control information.

18. The apparatus of claim 17, wherein the new information field comprises one of:

a hopping flag in the UE-specific control information; and

a new bit appended to the UE-specific control information.

19. The apparatus of claim 17, wherein the controller is further configured to determine that at least one of the group hopping and the sequence hopping of the UE-specific reference signals is disabled when a value of the new information field is one of ‘

0’ and

‘

1’

.

20. The apparatus of claim 12, wherein the controller is further configured to generate the UE-specific reference signal by generating parameters of the UE-specific reference signals, the parameters comprising at least a sequence-group number and a base sequence number.